<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>

      <!--登陆表单区域-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"
            placeholder="请输入账号或用户名"
          >
          </el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
            type="password"
            placeholder="请输入密码"
          >
          </el-input>
        </el-form-item>
        <!--按钮区域-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登陆</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data () {
    return {
      // 这是登陆表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 这是表单的验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          {
            required: true,
            message: '请输入登陆名称',
            trigger: 'blur'
          },
          {
            min: 3,
            max: 12,
            message: '长度在 3 到 12 个字符',
            trigger: 'blur'
          }
        ],
        // 验证密码是否合法
        password: [
          {
            required: true,
            message: '请输入登陆密码',
            trigger: 'blur'
          },
          {
            min: 6,
            max: 18,
            message: '长度在 6 到 18 个字符',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  methods: {
    // 点击重置登陆表单
    resetLoginForm () {
      // console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    // 表单登陆方法
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid)
        // eslint-disable-next-line no-useless-return
        if (!valid) return
        // 发送请求
        const { data } = await this.$http.post('login', this.loginForm)
        console.log(data)
        if (data.meta.status !== 200) return this.$message.error('登陆失败')
        this.$message.success('登陆成功')
        // 1、将登陆成功之后的token, 保存到客户端的sessionStorage(会话机制)中; localStorage中是持久化的保存
        //   1.1 项目中出现了登录之外的其他API接口，必须在登陆之后才能访问
        //   1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token', data.data.token)
        // 2、通过编程式导航跳转到后台主页, 路由地址为：/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;

    .login_box {
      width: 450px;
      height: 300px;
      background-color: #ffffff;
      border-radius: 3px;
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);

      .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #dddddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #ffffff;

        img {
          width: 100%;
          height: 100%;
          border-radius: 50%;
          background-color: #eee;
        }
      }

      .login_form {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 10px;
        box-sizing: border-box;
      }

      .btns {
        display: flex;
        justify-content: flex-end;
      }
    }
  }
</style>
